1)Which of the following has the largest momentum relative to Earth's surface?

a. a tightrope walker crossing Niagara Falls

b. a pickup truck speeding along a highway

c. a Mack truck parked in a parking lot

d. the Science building on campus

e. a mouse running across your room

2)Metals are shiny because

a. they reflect 100% of incident light.

b. they are poor absorbers of light.

c. their electrons vibrate to the oscillations of any incident light.

d. none of the above

3)A pair of toy freight cars, one twice the mass of the other, fly apart when a compressed spring that joins them is released. The spring exerts the greater force on the

a. heavier car.

b. lighter car.

c. same on each.

4)The high voltage that is important in a power line is high voltage

a. between the parallel wires of the line.

b. from one end of each power line to the other.

c. both of these

d. neither of these